Research And Design Of Near Field Millimeter Wave 36-40GHZ Antenna

In the past 20 years,semiconductor material production technology has been continuously updated,electronic hardware performance enhancement and modeling are highly integrated,and continuous optimization and improvement of imaging algorithms have driven the rapid development of millimeter wave imaging technology and become a frontier research hotspot for researchers.Because millimeter wave has strong penetration and does not react to specific materials,millimeter wave imaging can adapt to complex extreme environments,with high imaging resolution and fast imaging speed,in remote sensing,blind descent,navigation,object non-destructive detection,and security inspection,etc.Many fields have wide practical value and development prospects.Millimeter wave imaging is divided into active and passive.The active type requires the feed antenna to radiate electromagnetic waves to the measured target,and receive the electromagnetic waves reflected by the target to reconstruct the image.Therefore,in the millimeter wave imaging system,the performance of the feed antenna is directly related to the imaging quality of the system.This paper focuses on the feed antenna of the active millimeter wave imaging system.I have done the following work under previous research:First,analyze and compare the main types of feed antennas,analyze and simulate according to the characteristics of each antenna,and select the most suitable near-field millimeter based on the characteristics of high feed antenna gain,low side lobe level,and wide frequency band in the millimeter wave imaging system Viraldi antenna for wave imaging.To optimize the toe vivodi antenna in many aspects,first select the transmission line structure of the antenna,compare the common transmission line types,and select the transmission line structure with the best performance.Then optimize the slot line exponential curve and simulate different exponential functions to find the most suitable slot line design for the antenna in this frequency band.At the same time,the design of the new tail corrugated structure was completed,and the influence of different tail corrugated structures on the antenna divergent current and cross-polarization phenomenon was simulated.Finally,different new directors aredesigned after the dielectric substrate to comb the current,guide the energy in the radiating direction,and increase the antenna gain.Complete the antenna design,process the antenna,and perform physical imaging experiments to verify the antenna performance.